Bayer Aktiengesellschaft

Klaus Seyfried

Armand De Montigny

Hans-Joachim Meiners

Gunther Maass

Hans Joachim Lucking

Karl-Heinz Rudolph

Werner Buchner

Joachim Maas

Rolf Baumhakel

Hans-Joachim Lucking

A process for making cold-setting, non-shrinkable polyurethane foam resins using a mixture of silicon compounds of the formula:

Process for the production of cold-curing foam resins which contain

In the preparation of a cyclic diphenylsiloxane of the formula ##STR1## WHEREIN N IS 3 OR 4, BY HYDROLYSIS OF A DIPHENYLDIHALOGENOSILANE, THE IMPROVEMENT WHICH COMPRISES ADDING THE DIPHENYLDIHALOGENOSILANE, IN THE PRESENCE OF AN ORGANIC, APROTIC SOLVENT TO AN AQUEOUS BASIC SOLUTION, THE BASE BEING EMPLOYED IN AN AMOUNT WHICH IS AT LEAST STOICHIOMETRICALLY EQUIVALENT TO THE HALOGEN CONTENT, WHEREBY THE CYCLIC DIPHENYLSILOXANE IS OBTAINED IN HIGH YIELD AND PURITY. The base is preferably lithium hydroxide, potassium hydroxide or sodium hydroxide and is used in the form of an at least 5 molar solution, about 2.1 to 2.5 equivalents being used per mole of diphenyldihalogenosilane.

Preparation of cyclic diphenylsiloxanes

A process for the preparation of an organopolysiloxanol comprising contacting at least one organochlorosilane of the formula

Preparation of silanol containing organopolysiloxanes

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Schildgen, Germany

Klaus Seyfried